BibTeX

@ARTICLE{iumj2147,
    author = "Martino Bardi and Francesca da Lio",
     title = "Propagation of maxima and strong maximum principle for viscosity solutions of degenerate elliptic equations. II: Concave operators",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 52,
      year = 2003,
     issue = 3,
     pages = "607--628",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "35B50; 35J60; 35J70; 49L25; 90D25; 93E;",
}

amsrefs

\bib{iumj2147}{article}{
     author = {Bardi, Martino},
     author = {da Lio, Francesca},
      title = {Propagation of maxima and strong maximum principle for viscosity solutions of degenerate elliptic equations. II: Concave operators},
    journal = {Indiana Univ. Math. J.},
     volume = {52},
       year = {2003},
     number = {3},
      pages = {607 \ndash 628},
}